Donlin Gold Water Resources Management Plan

CLIENT: Donlin Gold LLC

LOCATION: South-western Alaska, USA

Donlin Gold LLC is proposing the development of an open-pit, hard rock gold mine in south-western Alaska. Beginning in 2003, BGC was retained by Donlin to support the proposed mine’s hydrological and hydrogeological studies and design through prefeasibility, feasibility and permitting stages of the project.

BGC’s hydrological design included the generation of a site-wide water balance model (WBM) for the construction, operations and closure phases of the proposed mine. The water balance modelling used both deterministic and probabilistic (stochastic) methods. BGC also provided hydrological designs for the layout of diversion channels, sizing of freshwater diversions, contact water dams, and spillways.

BGC’s hydrogeological support included development of numerical groundwater flow models to design the dewatering system for the open-pit, evaluate seepage from the proposed tailings storage facility, and to assess potential impacts of the mine on local surface waters. The results of the groundwater modelling studies were used as inputs to the WBM.

BGC has also provided site investigation services, including stream gauge monitoring systems, short and long term pumping tests, and evaluating a prototype dewatering well in the open-pit.

BGC has continued to work with Donlin at the site until present.

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